Wabash Avenue in Terre Haute is a popular place for the average hautian to hang out. Usually, bashing is done by sitting on a couch ("sofa") in the back of your pickup and driving up and down the 'Bash, usually soliciting young women to flash their breasts.
To bash is to grind and sweat at something, be it a game, a sport, anything. Bashes will become obsessed with a particular thing and spend a lot of their day doing it